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Synfacts 2008(9): 0931-0931  
DOI: 10.1055/s-2008-1078677
Synthesis of Materials and Unnatural Products
© Georg Thieme Verlag Stuttgart ˙ New York

A High-Spin (S = 2) Macrocycle

Contributor(s): Timothy M. Swager, Jan M. Schnorr
T. Sawai, K. Sato*, T. Ise, D. Shiomi, K. Toyota, Y. Morita, T. Takui*
Osaka City University and Osaka University, Japan
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Publikationsdatum:
22. August 2008 (online)

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Significance

The nitroxide radicals in macro­cycle 2 form a quintett state (S = 2) as shown by two-dimensional pulse-based electron-spin transient nutation (2D-ESTN) spectroscopy. Compound 2 crystallizes in a 1,3-alternate conformation and was obtained from the tetrabromo derivative 1 by lithiation, reaction with (t-BuNO)2 and subsequent oxidation. The monomeric unit 4 was also prepared to study differences in the spin structures of 4 and 2.